JavaScript编写棋盘覆盖

2018-06-24 00:03:58来源：未知阅读 ()

一、前言

之前做了一个算法作业，叫做棋盘覆盖，本来需要用c语言来编写的，但是因为我的c语言是半桶水（哈哈），所以索性就把网上的c语言写法改成JavaScript写法，并且把它的覆盖效果显示出来

二、关键代码

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>算法作业2</title>
<style type="text/css">
    #num{}
    #chess{
        margin-top:20px;
        }
</style>
</head>
<body>
    <div id="num">
        <p>设置棋盘大小：
            <input type="text" name="Num" size="4" />
        </p>
        <p>请输入特殊方格的位置：</p>
        <p>
        x:<input type="text" name="X" size="25"/><br />
        y:<input type="text" name="Y" size="25" />
        </p>
        <p>
            <input type="button" value="设置棋盘参数" />
                  
            <input type="button" value="生成棋盘" />
        </p>
    </div>
    <div id="chess">
    </div>
</body>
</html>

<script type="text/javascript">
    window.onload=function()
    {//棋盘设置
        var chess=document.getElementById('chess');
        var input=document.getElementsByTagName('input')[3];
        input.onclick=function()
        {
            var N=document.getElementsByTagName('input')[0].value;
            var table=document.createElement('table');
            chess.appendChild(table);
            table.style.border='2px solid';
                table.style.borderCollapse='collapse';
            for(var i=0;i<N;i++)
            {
                var tr=document.createElement('tr');
                table.appendChild(tr);
                tr.style.height = "20px";
                tr.style.border='1px solid #ccc';
                for(var j=0;j<N;j++)
                {
                    var td=document.createElement('td');
                    tr.appendChild(td);
                    td.style.width = "20px";
                    td.style.border='1px solid #ccc';
                }
            }    
        
        }
        var Out=document.getElementsByTagName('input')[4];
        var  Matrix =  new Array();     
        for(var i=0;i<100; i++)
        {  //初始化棋盘矩阵
               Matrix[i] = new Array();    
               for(var j=0;j<100;j++)
            {
                  Matrix[i][j]=0;
               }
        }
        Out.onclick=function()
        {  //棋盘生成
            var r,c;
            var X=document.getElementsByTagName('input')[1].value;
            var Y=document.getElementsByTagName('input')[2].value;
            var N=document.getElementsByTagName('input')[0].value;
            chessBoard(0,0,X-1,Y-1,N);
            for (r = 0; r < N; r++)
            {
                for (c = 0; c < N; c++)
                {
                     var q=Matrix[r][c];
                     var table=document.getElementsByTagName('table')[0];
                     table.rows[r].cells[c].style.background='rgb('+13*q%256+','+43*q%256+','+73*q%256+')';
                }
            
            }
        }
        var nCount = 0;
        function chessBoard(tr,tc,dr,dc,size)
        {
            var s,t;
            if (size == 1) return;
            s =size/2;
            t = ++nCount ;
            if (dr < tr + s && dc < tc +s)
                chessBoard(tr,tc,dr,dc,s);
            else
            {
                Matrix[tr+s-1][tc+s-1] = t;
                chessBoard(tr,tc,tr+s-1,tc+s-1,s);
            }
            if (dr < tr + s && dc >= tc + s )
                chessBoard(tr,tc+s,dr,dc,s);
            else
            {
                Matrix[tr+s-1][tc+s] = t;
                chessBoard(tr,tc+s,tr+s-1,tc+s,s);
            }
            if (dr >= tr + s && dc < tc + s)
                chessBoard(tr+s,tc,dr,dc,s); 
            else
            {
                Matrix[tr+s][tc+s-1] = t;
                chessBoard(tr+s,tc,tr+s,tc+s-1,s);
            }
            if (dr >= tr + s && dc >= tc + s)
                chessBoard(tr+s,tc+s,dr,dc,s);
            else
            {
                Matrix[tr+s][tc+s] = t;
                chessBoard(tr+s,tc+s,tr+s,tc+s,s);
            }
        }
    }
</script>